STUDY OF YUCCA ANGUSTIFOLIA 
141 
it did not clear up on warming. Hydrochloric -acid made a 
muddy mixture with the alcoholic solution. The ethereal resi¬ 
due was not entirely soluble in acetic ether; the latter sepa¬ 
rated coloring matter from it. The ethereal residue insoluble 
in acetic ether and freed from coloring matter (chlorophyll) 
was a resinous substance. It melted at 8o° C. The resin was 
boiled with absolute alcohol, and on throwing the alcoholic 
solution into cold water it was precipitated as a white cloud. 
It was not saponified. 
Extract (4), Yellow Base of Leaf. 
The residual powder from the petroleum spirit macera¬ 
tion was dried and extracted with stronger ether. The ether 
extract was a turbid yellow liquid, slightly acid in reaction. 
On evaporating the ethereal extract at the ordinary tempera¬ 
ture a reddish-yellow granular solid remained. It melted at 
79 0 C. For the determination of total solids extracted, a defi¬ 
nite volume of the extract was evaporated, dried, and weighed. 
I. 
TOTAL SOLIDS. 
Ethereal residue dried at ioo° C.1.7 per cent, of solids. 
“ “ “ iio° C...1.7 “ “ “ 
72 “ “ loss. 
The ethereal residue was treated successively with distilled 
water, alcohol, and ether. 
II. 
Substances soluble in ether and water.0.8 per cent. 
“ “ u ether and alcohol.0.4 “ 
4 “ “ water and alcohol. 0.5 “ 
Total solids .1.7 “ 
The aqueous extract gave a neutral reaction with litmus. 
Negative results followed examination for tannin, gallic acid, 
glucosides, alkaloids, and any compounds containing nitrogen. 
